luac: ...bdbf68d574f1472c0c2a0dcccac69/trees/8380572d1d594c806eb224cb2d00c228.tma:20: unfinished string near ''Icon'

This could be caused by the fact that my system (Macintosh OSX) here and there files with the name Icon? (the ? is part of the name) are sprinkled.

I suspect the unfinished string is triggered by the trailing questionmark

Is it harmful? Can this be prevented, acting on the maxim: "silence the compiler"?